===================================================== BUG: KMSAN: uninit-value in eth_skb_pkt_type include/linux/etherdevice.h:628 [inline] BUG: KMSAN: uninit-value in eth_type_trans+0x7d5/0x9b0 net/ethernet/eth.c:165 eth_skb_pkt_type include/linux/etherdevice.h:628 [inline] eth_type_trans+0x7d5/0x9b0 net/ethernet/eth.c:165 ip_tunnel_rcv+0x2d98/0x3610 net/ipv4/ip_tunnel.c:439 erspan_rcv net/ipv4/ip_gre.c:354 [inline] gre_rcv+0x1c8c/0x20e0 net/ipv4/ip_gre.c:458 gre_rcv+0x285/0x380 net/ipv4/gre_demux.c:163 ip_protocol_deliver_rcu+0xb2c/0x13d0 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x409/0x730 net/ipv4/ip_input.c:241 NF_HOOK include/linux/netfilter.h:318 [inline] ip_local_deliver+0x228/0x4b0 net/ipv4/ip_input.c:262 dst_input include/net/dst.h:474 [inline] ip_rcv_finish+0x4f7/0x5c0 net/ipv4/ip_input.c:453 NF_HOOK include/linux/netfilter.h:318 [inline] ip_rcv+0xcb/0x380 net/ipv4/ip_input.c:573 __netif_receive_skb_one_core net/core/dev.c:6137 [inline] __netif_receive_skb+0x312/0xac0 net/core/dev.c:6250 process_backlog+0x47c/0x9f0 net/core/dev.c:6602 __napi_poll+0xd8/0x880 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0xa45/0x1c90 net/core/dev.c:7881 handle_softirqs+0x169/0x6e0 kernel/softirq.c:622 __do_softirq+0x14/0x1b kernel/softirq.c:656 do_softirq+0x99/0x100 kernel/softirq.c:523 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline] __dev_queue_xmit+0x3c32/0x58f0 net/core/dev.c:4844 dev_queue_xmit include/linux/netdevice.h:3381 [inline] neigh_resolve_output+0x9c5/0xaf0 net/core/neighbour.c:1594 neigh_output include/net/neighbour.h:556 [inline] ip_finish_output2+0x1abf/0x1d50 net/ipv4/ip_output.c:237 __ip_finish_output net/ipv4/ip_output.c:-1 [inline] ip_finish_output+0x292/0x8e0 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_mc_output+0x58a/0x8d0 net/ipv4/ip_output.c:422 dst_output include/net/dst.h:464 [inline] ip_local_out net/ipv4/ip_output.c:131 [inline] __ip_queue_xmit+0x20ed/0x2140 net/ipv4/ip_output.c:534 sctp_v4_xmit+0x758/0x1190 net/sctp/protocol.c:1060 sctp_packet_transmit+0x42e3/0x4620 net/sctp/output.c:653 sctp_packet_singleton+0x2e3/0x450 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x71c/0x67c0 net/sctp/outqueue.c:1212 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a64/0x2250 net/sctp/socket.c:1840 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2030 inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:859 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x278/0x3d0 net/socket.c:742 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: pskb_expand_head+0x310/0x15d0 net/core/skbuff.c:2290 skb_expand_head+0x416/0x860 net/core/skbuff.c:2452 ip_finish_output2+0xe48/0x1d50 net/ipv4/ip_output.c:218 __ip_finish_output net/ipv4/ip_output.c:-1 [inline] ip_finish_output+0x292/0x8e0 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_mc_output+0x58a/0x8d0 net/ipv4/ip_output.c:422 dst_output include/net/dst.h:464 [inline] ip_local_out net/ipv4/ip_output.c:131 [inline] __ip_queue_xmit+0x20ed/0x2140 net/ipv4/ip_output.c:534 sctp_v4_xmit+0x758/0x1190 net/sctp/protocol.c:1060 sctp_packet_transmit+0x42e3/0x4620 net/sctp/output.c:653 sctp_packet_singleton+0x2e3/0x450 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x71c/0x67c0 net/sctp/outqueue.c:1212 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a64/0x2250 net/sctp/socket.c:1840 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2030 inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:859 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x278/0x3d0 net/socket.c:742 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5258 [inline] __do_kmalloc_node mm/slub.c:5651 [inline] __kmalloc_node_track_caller_noprof+0xb77/0x1c90 mm/slub.c:5759 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:608 __alloc_skb+0x866/0x10a0 net/core/skbuff.c:690 alloc_skb include/linux/skbuff.h:1383 [inline] sctp_packet_transmit+0x44b/0x4620 net/sctp/output.c:598 sctp_packet_singleton+0x2e3/0x450 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x71c/0x67c0 net/sctp/outqueue.c:1212 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a64/0x2250 net/sctp/socket.c:1840 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2030 inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:859 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x278/0x3d0 net/socket.c:742 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 23822 Comm: syz.3.5971 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 =====================================================